Neil Booth 9a6dcf7b1e Use bucketing to choose coins ...

Bucketing is generalization of coin chooser logic that makes it easy
to implement other algorithms.

- Put core coin chooser functionality in base class.
- Specialize derived class to implement classic electrum algorithm of
  oldest coins first.  One bucket per output.

No intended change in behaviour.
Coin chooser now sorts the coins as it wants; remove redundant sorting
from get_spendable_coins().

2015-11-29 17:59:36 +09:00

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